Geodetics is the science that deals with the measurement and representation of the Earth's shape, orientation in space, and gravitational field. It combines mathematics, physics, and engineering to create accurate models of the Earth, which are essential for navigation, mapping, and land surveying. This field is crucial for various applications, including the development of GPS technology and the creation of topographic maps. Geodetics helps in understanding how the Earth changes over time due to natural processes and human activities, making it vital for environmental monitoring and urban planning.